\begin{table}[tbhp] \centering {\begin{tabular}{l*{5}{c}}
\hline
                    &\multicolumn{1}{c}{2002}&\multicolumn{1}{c}{2003}&\multicolumn{1}{c}{2004}&\multicolumn{1}{c}{2005}&\multicolumn{1}{c}{2006}\\
\hline
a11 last month hours worked&       167.2&       166.0&       164.3&       167.7&       168.2\\
                    &     (54.48)&     (58.62)&     (58.19)&     (57.14)&     (56.38)\\
 \hline
\hline
\end{tabular} } \end{table} 
